package cn.tedu.v5;

 import java.io.*;
 import java.net.ConnectException;
 import java.net.Socket;
 import java.net.UnknownHostException;
 import java.util.Scanner;

public class Client
{
    private Socket socket;
    private static final String HOST="127.0.0.1";
    private static final Integer PORT=6666;
    private PrintWriter pw;
    private BufferedReader br;

    public Client()  {
        try  {
             socket=new Socket(HOST,PORT);
             br=new BufferedReader(new InputStreamReader(socket.getInputStream(),"UTF8"));
             pw=new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(),"UTF8")),true);
        }  catch (NullPointerException e){
            System.out.println("友情提示：IP传入错误导致链接失败~");
        }  catch (UnknownHostException e){
             System.out.println("友情提示：IP传入错误");
        } catch (ConnectException e){
             System.out.println("客户端链接失败：建议检查IP或者端口号");
        } catch (IOException e) {
             System.out.println("客户端链接服务器失败，提示：检查IP/端口");
        }
    }

    public void start () {
        //与服务器端交互---参考Server
         System.out.println("~~欢迎使用XX牌QQ聊天室~~");
         Scanner input=new Scanner(System.in);
        try  {
            //1.读入服务器端： “请输入用户名：”
             String serverMessage=br.readLine();
            //1.1显示“请输入用户名：”
             System.out.println(serverMessage);
            //1.2 用户输入--用户名
             String username=input.nextLine();
            //1.3 用户输入的用户名--写出给服务器端
             pw.println(username);

            //2.1 读入服务器端发来 "请输入密码："
             serverMessage=br.readLine();
             System.out.println(serverMessage);
            //2.2 用户输入--密码---写出给服务器端
             String password=input.nextLine();
             pw.println(password);

            //3.登录之后【登录成功、登录失败】--才可以聊天
             serverMessage=br.readLine(); //读入【登录成功、登录失败】
            //字符串方法：startsWith() 返回值 boolean 前缀名称一致true
            if(serverMessage.startsWith("登录成功")) {
                //封一个客户端的：读写流---chat聊天
                chat();
            }
        }  catch (IOException e) {
            System.out.println("客户端断开连接了！");
        }  finally  {
            if(br!=null)
                try {
                    br.close();
                }  catch (IOException e)  {
                    System.out.println("客户端关闭失败~");
                }
             if(pw!=null)
                 pw.close();
             if(socket!=null&&!socket.isClosed())
                try  {
                    socket.close();
                }  catch (IOException e)  {

                    System.out.println("通讯关闭失败~");
                }
        }
    }
    //封装一个针对聊天功能：读写  chat()
    private void chat () {
         new Thread(()->{
            try  {
                 String message;
                 while((message=br.readLine())!=null){

                   System.out.println("服务器端说：" +message);
                     System.out.println("客户端请输入：");
                 }
            }   catch (IOException e)  {
                  System.out.println("服务器端读入失败！");

            }
         }).start();

         Scanner input=new Scanner(System.in);
         while(true)
         {
              System.out.println("客户端请输入：");
              String line=input.nextLine();
             pw.println("客户端说："+line);
        }
    }
      public static void main(String[] args){
        new Client().start();
    }
}
